FFF sorry to point this out but you got it wrong. See the explaination given in Flarkey's url. It explains it all (and is exactly as I was taught in the Navy).
BTW one of those "obscure"
places just happens to be where I was born and dragged up out of the gutter. Using the letter system a place with 30 minutes difference is indicated by the use of the the two letters either side.
Adelaide, South Australia which just happens to be GMT+9:30 (normal time) GMT+10:30 (daylight saving). So in good military talk the time in Adelaide is either 1500IK or 0530Z or five hours thirty minutes universal coordinated time.
I have found the best place to find the time and date to be
http://www.timeanddate.com/worldclock